645353401632 has 48 divisors (see below), whose sum is σ = 1722765451680. Its totient is φ = 211471734272.

The previous prime is 645353401619. The next prime is 645353401669. The reversal of 645353401632 is 236104353546.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56964093 + ... + 56975420.

It is an arithmetic number, because the mean of its divisors is an integer number (35890946910).

Almost surely, 2^645353401632 is an apocalyptic number.

It is an amenable number.

645353401632 is an abundant number, since it is smaller than the sum of its proper divisors (1077412050048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645353401632 is a wasteful number, since it uses less digits than its factorization.

645353401632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113939585 (or 113939577 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 42.

The spelling of 645353401632 in words is "six hundred forty-five billion, three hundred fifty-three million, four hundred one thousand, six hundred thirty-two".